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JEE Main & Advanced Chemistry Nitrogen Containing Compounds Question Bank Self Evaluation Test - Amines

  • question_answer
    In the reaction, \[C{{H}_{3}}CN+2H\xrightarrow{{}}X\xrightarrow{Boiling\,{{H}_{2}}O}\text{Y},\] the Term Y is

    A) acetone  

    B) ethanamine

    C) acetaldehyde    

    D) dimethylamine

    Correct Answer: C

    Solution :

    [c] \[C{{H}_{3}}CN+2H\to \underset{X}{\mathop{C{{H}_{3}}CH}}\,=NH\xrightarrow{{{H}_{2}}O,boil}\underset{Y}{\mathop{C{{H}_{3}}CHO}}\,\] Note that cyanides are reduced only by 2H atoms, so reduction stops at aldimine stage which on hydrolysis with water gives aldehyde; it is an example of Stephen's reaction.


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